MIDDLE MARKET CREDIT FUND, LLC - Schedule of Credit Facilities (Details) - Credit Fund - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Mar. 20, 2025	Jun. 30, 2026	Jun. 30, 2025
Line of Credit Facility, Increase (Decrease) [Roll Forward]
Outstanding borrowings, beginning of period				$ 589,000
Outstanding borrowings, end of period	$ 1,002,509			1,002,509
Credit Fund Facility
Line of Credit Facility, Increase (Decrease) [Roll Forward]
Outstanding borrowings, beginning of period	0	$ 0	$ 0	40,500	$ 0
Borrowings	0	0		0	0
Repayments	0	0		(40,500)	0
Outstanding borrowings, end of period	0	0		0	0
Credit Fund Sub 2016 Facility
Line of Credit Facility, Increase (Decrease) [Roll Forward]
Outstanding borrowings, beginning of period			189,221		189,221
Borrowings			29,000
Repayments			(218,221)
Outstanding borrowings, end of period			0
Credit Fund Sub 2025 Facility
Line of Credit Facility, Increase (Decrease) [Roll Forward]
Outstanding borrowings, beginning of period	652,500	430,000	$ 0	589,000	0
Borrowings	293,347	19,000		433,847	449,000
Repayments	(59,000)	(47,000)		(136,000)	(47,000)
Foreign currency translation	(62)	0		(62)	0
Outstanding borrowings, end of period	886,785	$ 402,000		886,785	$ 402,000
Credit Fund Subscription Facility
Line of Credit Facility, Increase (Decrease) [Roll Forward]
Outstanding borrowings, beginning of period	75,724			0
Borrowings	40,000			115,724
Repayments	0			0
Outstanding borrowings, end of period	$ 115,724			$ 115,724